package com.hl.toolkit.server.util;


import org.apache.xerces.impl.dv.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

public class DesUtil
{
 public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
 /**
  * DES算法，加密
  *
  * @param data 待加密字符串
  * @param key 加密私钥，长度不能够小于8位
  * @return 加密后的字节数组，一般结合Base64编码使用
  * @throws CryptException 异常
  */
 public static String encode(String key,String data) throws Exception
 {
  return encode(key, data.getBytes());
 }
 /**
  * DES算法，加密
  *
  * @param data 待加密字符串
  * @param key 加密私钥，长度不能够小于8位
  * @return 加密后的字节数组，一般结合Base64编码使用
  * @throws CryptException 异常
  */
 public static String encode(String key,byte[] data) throws Exception
 {
  try
  {
        DESKeySpec dks = new DESKeySpec(key.getBytes());
  
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
   //key的长度不能够小于8位字节
   Key secretKey = keyFactory.generateSecret(dks);
   Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
   IvParameterSpec iv = new IvParameterSpec(key.getBytes());
   AlgorithmParameterSpec paramSpec = iv;
   cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
  
   byte[] bytes = cipher.doFinal(data);
  
  
//   return byte2hex(bytes);
   return new String(Base64.encode(bytes));
  } catch (Exception e)
  {
   throw new Exception(e);
  }
 }
  
 /**
  * DES算法，解密
  *
  * @param data 待解密字符串
  * @param key 解密私钥，长度不能够小于8位
  * @return 解密后的字节数组
  * @throws Exception 异常
  */
 public static byte[] decode(String key,byte[] data) throws Exception
 {
  try
  {
    SecureRandom sr = new SecureRandom();
        DESKeySpec dks = new DESKeySpec(key.getBytes());
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
   //key的长度不能够小于8位字节
   Key secretKey = keyFactory.generateSecret(dks);
   Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
   IvParameterSpec iv = new IvParameterSpec(key.getBytes());
   AlgorithmParameterSpec paramSpec = iv;
   cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
   return cipher.doFinal(data);
  } catch (Exception e)
  {
   throw new Exception(e);
  }
 }
  
 /**
  * 获取编码后的值
  * @param key
  * @param data
  * @return
  * @throws Exception
  */
 public static String decodeValue(String key,String data) 
 {
    byte[] datas;
    String value = null;
        try {
  
            datas = decode(key, Base64.decode(data.getBytes()));
  
            value = new String(datas);
        } catch (Exception e) {
            value = "";
        }
    return value;
 }
  
 public static void main(String[] args) throws Exception
 {
    System.out.println("明：abcdefg ；密：" 
 + DesUtil.encode("12345678","abcdefg")+"\r\n 解密后的："
 +DesUtil.decodeValue("12345678",DesUtil.encode("12345678","abcdefg")));
 }
}
